Flop: Against rather considered loose opponent I don't like CBetting such boards at all. He is never folding any pair nor draw. Therefore I would Check behind and most likely plan to give up.

As playedRiver: Well, why do you think he would even turn his Qx/Jx into bluff if he has showdown value? I don't really see myself calling in those spots vs unknown especially haven't invested much into the pot.